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7z beats other codecs on 24bit 48khz sample, Split from: "Which is the best lossless codec?"
Dave_Scream
post Aug 17 2013, 09:55
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I just lold ))
flac highest 610 -> 377
monkey's insane 610 -> 375
7zip 610 -> 211

Use 7zip guys )))
---
UPD. added Monkeys audio

This post has been edited by Dave_Scream: Aug 17 2013, 10:06
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Jan S.
post Aug 17 2013, 11:25
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I fail to see how this is interesting that you found one file where 7z wins.

I tried on an album:
wav: 678MB
7z: 572MB
rar: 373MB
wv: 255MB


I would take any wager on general compressors losing that battle 95%+ of the time.
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Dave_Scream
post Aug 17 2013, 11:31
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QUOTE (Jan S. @ Aug 17 2013, 04:25) *
I fail to see how this is interesting that you found one file where 7z wins.

I tried on an album:
wav: 678MB
7z: 572MB
rar: 373MB
wv: 255MB


I would take any wager on general compressors losing that battle 95%+ of the time.

strange. maybe its because I used 24bit 48khz wav input? and lossless codecs are not optimized good to compress >22khz frequencies? so pure math of 7z make it winner?
here is the link to my test file http://yadi.sk/d/hpGxgr9y8-z1e
and here is spectrogramm that shows that frequencies >22khz available


This post has been edited by Dave_Scream: Aug 17 2013, 11:33
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TBeck
post Aug 17 2013, 13:54
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QUOTE (Dave_Scream @ Aug 17 2013, 12:31) *
strange. maybe its because I used 24bit 48khz wav input? and lossless codecs are not optimized good to compress >22khz frequencies? so pure math of 7z make it winner?
here is the link to my test file http://yadi.sk/d/hpGxgr9y8-z1e

One possible explaination: Quite few of the possible sample values between the files minimum and maximum value are present in the file. That's nice for general purpose file compressors.

Some possible reasons:

- Amplification by a quite large factor
- Companded source signal (a-law, u-law etc.)

The resulting sample distribution then contains a lot of holes.

While some audio compressor can detect an amplification by an integer power of 2 (the wasted bits feature), to my knowledge only OptimFrog's experimental mode can take advantage of other transformations.

I tried it. Because this feature currently only works for 16 bit samples, i converted your file to 16 bit / 96 khz (without dithering).

Results:

Optimfrog Normal: 41.87 % (of the uncompressed file size)
Optimfrog Normal -- experimental: 29.46 %

This seems to support my hypothesis.

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Posts in this topic
- Dave_Scream   7z beats other codecs on 24bit 48khz sample   Aug 17 2013, 09:55
- - Propheticus   Have you tried zipping the flac or other codecs? T...   Aug 17 2013, 10:41
|- - Dave_Scream   QUOTE (Propheticus @ Aug 17 2013, 03:41) ...   Aug 17 2013, 10:56
- - Propheticus   I can see how this is interesting for purely archi...   Aug 17 2013, 11:06
|- - saratoga   QUOTE (Propheticus @ Aug 17 2013, 06:06) ...   Aug 18 2013, 03:51
- - Jan S.   I fail to see how this is interesting that you fou...   Aug 17 2013, 11:25
|- - Dave_Scream   QUOTE (Jan S. @ Aug 17 2013, 04:25) I fai...   Aug 17 2013, 11:31
||- - TBeck   QUOTE (Dave_Scream @ Aug 17 2013, 12:31) ...   Aug 17 2013, 13:54
|- - Thundik81   QUOTE (Jan S. @ Aug 17 2013, 03:25) I fai...   Aug 18 2013, 10:54
|- - Porcus   Since the thread is already bumped: QUOTE (Thund...   Jan 3 2014, 00:57
|- - bryant   QUOTE (Porcus @ Jan 2 2014, 15:57) (A cou...   Jan 3 2014, 03:13
||- - Porcus   Ah, 32767 ... almost facepalming I didn't thin...   Jan 3 2014, 09:19
||- - bryant   QUOTE (Porcus @ Jan 3 2014, 00:19) QUOTE ...   Jan 4 2014, 20:40
|- - Mangix   QUOTE (Porcus @ Jan 2 2014, 15:57) Since ...   Jan 3 2014, 11:14
|- - thebombzen   QUOTE (Mangix @ Jan 3 2014, 05:14) QUOTE ...   Jan 9 2014, 23:06
- - lvqcl   My test: WAV 16/44: 569 743 820 bytes 7z LZMA Ult...   Aug 17 2013, 11:30
- - Nystagmus   Although not directly related to this conversation...   Nov 10 2013, 22:17
- - kode54   Yes, and that component decompresses the entire fi...   Nov 11 2013, 02:37
- - Seren   I was wondering... does it work out better if you ...   Nov 11 2013, 19:40
|- - xnor   QUOTE (Seren @ Nov 11 2013, 20:40) I was ...   Nov 11 2013, 20:25
- - pdq   On the other hand, since WinZip can compress with ...   Nov 11 2013, 21:41
- - kode54   And only WinZip can unpack those.   Nov 12 2013, 02:42
- - probedb   Also bear in mind 7-zip isn't actively develop...   Nov 12 2013, 12:52
|- - xnor   QUOTE (probedb @ Nov 12 2013, 13:52) Also...   Nov 12 2013, 14:14
|- - probedb   QUOTE (xnor @ Nov 12 2013, 13:14) Then wh...   Nov 13 2013, 09:34
- - (Sly)   By the way 7-zip LZMA Ultra uses 64 MB dictionary ...   Nov 12 2013, 18:28
- - bryant   I took a look at this file, and as Thomas says, th...   Nov 12 2013, 19:24
- - birdie   I smell something extremely fishy here. Like your...   Nov 13 2013, 10:11
|- - Kees de Visser   Just to make sure: is the test file in 24 bit 96 k...   Nov 13 2013, 11:36
- - Juha   Probably the test sample wav were recorded using s...   Nov 13 2013, 12:26
- - 2Bdecided   bryant's already explained exactly what's ...   Nov 13 2013, 12:32
- - Nystagmus   I'm not going to claim which technique(s) I th...   Jan 2 2014, 23:01
- - ktf   I've used XZ (which uses a compression algorit...   Jan 3 2014, 09:38
- - Porcus   As a sidenote, after someone here on HA pointed ou...   Jan 3 2014, 16:49
|- - bryant   QUOTE (Porcus @ Jan 3 2014, 07:49) As a s...   Jan 4 2014, 20:36
- - Mangix   FLAC would probably do better on general files if ...   Jan 4 2014, 00:22


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